Alternative meaning, popularized by the the Soulja Boy song of the same title. Crank dat refers to the act of masturbation, as indicated by the lyrics "watch me "crank dat" soldier boy then superman that hoe"
Watch me crank dat soldier boy then superman dat hoe...OR...watch me masturbate my erect
penis then ejaculate on this promiscuous woman's back before sticking
a sheet to the soiled spot on her back causing an eventual cape-like